Swivel device
AssigneeFramo Engineering AS
InventorJens Ødegaard
Life of this patent
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Abstract
The invention relates to a sealing device for a swivel, an improved attachment device and a method for improving a seal in a swivel, where a sealing medium is composed according to the viscosity and chemical composition of the application concerned and has a viscosity substantially over 500 cst and where the sealing medium is pressurized by a pressure transmission unit.
Claims10
A sealing device for sealing a fluid transfer channel to prevent fluid flowing in the fluid transfer channel from leaking through a sealing body, wherein the fluid transfer channel is composed of two elements, the sealing body mounted between mutually facing surfaces of the two elements, wherein a supply line is provided for the supply of a pressurised barrier fluid during use of the fluid transfer channel, at a side of the sealing body which normally faces away from the fluid transfer channel, wherein the sealing device comprises a supply line for barrier fluid connected to the supply line via a first valve, and a sealing medium circuit comprising a pressure transmission unit, which is connected to the supply line for barrier fluid via a first sealing medium valve and is connected to the supply line via a supply line for sealing medium and second sealing medium valve, wherein the sealing medium has a higher viscosity than the barrier fluid.
A method for providing a seal in a swivel, which seal comprises at least one sealing body and a barrier fluid circuit for supply of barrier fluid to the side of the sealing body normally facing away from a fluid transfer channel in the swivel, and, on detection of loss of barrier fluid in the barrier fluid circuit, a sealing medium circuit comprising a pressure transmission unit is mounted between the barrier fluid circuit and the sealing body, which sealing medium in the circuit is forced in towards the sealing body via the supply line for the barrier fluid circuit or a separate supply line to the sealing body, by means of the pressure in the barrier fluid circuit thereby providing the seal in the swivel, wherein the pressure transmission unit is connected to a supply line for barrier fluid via a first sealing medium valve and is connected to a supply line via a supply line for sealing medium and second sealing medium valve, wherein the sealing medium has a higher viscosity than the barrier fluid.
Dependencies are inferred from the claim text.